How This Works
Your final drive ratio is simply rear sprocket teeth divided by front sprocket teeth. A bigger rear (or smaller front) lowers your gearing, quicker acceleration, lower top speed, better for tight technical trail. A smaller rear (or bigger front) raises your gearing, higher top speed, less low-end snap, better for fast open terrain.
Top speed is estimated from your engine RPM, tire diameter, and total drivetrain reduction (final drive ratio × internal gearbox/primary ratio). Adding or removing even one or two teeth on the rear sprocket can shift top speed and acceleration noticeably, the comparison table above shows how nearby options stack up against your current setup.
- Going up 1–2 teeth on the rear (or down 1 on the front): quicker off the line, lower top speed. Good for tight single-track or hard enduro.
- Going down 1–2 teeth on the rear (or up 1 on the front): higher top speed, less aggressive acceleration. Good for desert, fire roads, or faster MX tracks.
This is a planning estimate, not a dyno-verified number, always confirm chain length compatibility before swapping sprockets, and re-torque your rear axle and chain adjusters after any gearing change.